"Robotic ghost knifefish" sounds like an affiliate member of the Wu-Tang Clan, but it's actually an awesome aquatic automaton built by researchers at Northwestern University. Check out this marine machine in motion.

Our brothers-in-arms over at Gizmodo Poland have stumbled upon something magical. Witness Mecha Fish, so named by me because it is a fearsome beast that navigates kiddie pools and cannot be tamed thanks to a kind of rudimentary Bluetooth echolocation.

So it's not expressly intended to provide baby Asimos with unfulfilling relationships, but that would be adorable, no? In reality, it fancies itself an industrial tool, for monitoring "pipelines, sunken ships, and pollution." Where's your whimsy, robofish?

Robots can already mimic people, dogs, cats and insects. They can even walk on water. Now roboticists at the University of Washington have built a school of three robotic fish that swim and communicate wirelessly with one another using sonar signals. So far the fish are swimming happily in a laboratory tank, but…

One day in the near future, when humanity has killed off all the fish in the sea, we'll be able to replace every single on of them using the research of University of Washington UW assistant professor Kristi Morgansen. That's because Morgansen, with her 10,000-gallon UW test tank, has almost perfected an autonomous…

Spycraft: The Secret History of the CIA's Spytechs from Communism to Al-Qaeda goes on sale in stores today. I know you think I probably milked it for all it's worth, but there's actually a ton of mind-boggling spy gear in there that I didn't have a chance to cover on Giz, such as: